Gun-barrel.



Witt-.init s. Evans, or' Leserin-URC, vPatinstrattabili;1' f.

SPECIFICATION forming-part' of Letter; patent No. 660,496, dated october'as, loco.

Application liled July 15, 1.899.

I'o all w/wml it may concern.'

Be it known that I, WILLIAM S. EvANs, of Leechburg, in the county of Armstrong and Slate of Pennsylvania, have invented a new and useful Improvement in Breech-L0ading Firearms, of which the following is a full, clear, and exact description. v

The object of my invention is to construct a breech-loatlin g firearm in such manner that the barrel will be provided with a chokebore and in which the riding of the barrel will in. crease in sharpness in a certain ratiofrorn the breech to the muzzle.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully'set forth, and pointed out in the claims.

Reference is to be had' to the accompanying drawings, forming a part of this speciication.I in which similar characters of reference'indicate corresponding parts in both figures.

Figure 1 is a longitudinal -section through a portion of a gun-barrel having the inven' tion applied, and Fig. 2 is a continuation of the sectional view of thebarrel shown in Fig. 1. l

The rifle shown is intended to represent one of thirty-five caliber, which I am aware is not the ordinary caliber, and the entire ride is to be about fifty-four inches; but although I have illustrated a rifle of the above-named dimensions the improvement to be .hereinaf-v ter described may be applied to the ordinary or standard rifle. The barrel B is provided with a true taper choke-,bore 10 from breech to muzzle, and the taper is in about the ratio of thirty-seven caliber at the breech, thirtysix caliber at the center of the barrel, and thirty-fivecaliber at the muzzle. The ritling of the barrel commences at the breech, one tum in about nine inches. This section of rifiing extends. from b to b', (see Fig.. 1,) and -in the section of the barrei between b' a'nd b2 the riding is one turn in eight inches," as' is also shown in Fig. 1, While, asx-illustrated in Figi 2, in the section of the barrel between and b" the rifling is one turn in seven inches, and in the part of the barrel between b*l and b the rifling is one turn in six inches. A In that portion of the bore of the barrel betweenA band b", or the' muzzle, the riding is one turn Seal Bo.'723.889. (lo modul.)

in rive inches. Thus the here affine barrel is provided with ve successive turns, inf l"creae'sing in sharpness from the breech to the muzzle. This increase in'the sharpnessof 55 the pitch in each successive tu rn .n the riding serves to greatly increase the revolution of thebullet in its passage from the breech to the m azzle.

The above applies to rifle-barrels of a speci 6o' iied caliber; hut under' my system in riding gun-barrels in general I employ one turn in thirty calibers, a second turn in twenty-five calibers, a third turnin twenty calibrs, n fourth turn in fifteen calibers, anda last turn il. ten calibers. g The .riding-cuts throughout the bore of the Y barrelarefof true parallel, and thus as the barrelhas a choke-bore the riilingis shallow at the breech, but deeper at the muzzle, thus 1o afordnga greater hold upon the bullet where the riding is given the sharpest turns.

The word parallelism is intended to dene the grooves of A the barrel as being of uniform depth or distance from the axis of the bore throughout their length, and therefore the grooves are concentric.

Having thus described my invention, I claim as new and desire to secure by Letters Patent l. A rifle-barrel which-tapers uniformly from the rear to the front end and in which the ritlingis of uniform radial distance from the axis o f the bore.

\2. A choke rifle-barrel, the rifling whereof is ofluniform radial distance from the axis of the bore, the bore tapering uniformly from the rear tothe front end, Athe riiiingbengsue cessivelyand'gradua-lly increased in the numb bex-"of turns toan inch in the ratio of about 9o.

one inch in each section of riding, the least number of turns to the inch `being at the breech of the. barrel, a greater number of turns near the center and the greatest nuin ber Vof turns at the muzzle, and the lands of the riding being parallel throughout'the length of the barrel. WILLIAM S. EVANS.

Witnesses; t LEWIS M. McDERMor'r,

JOHN F. HILL. 

